Sister In The Cellar

The noises from the basement had been a thing from her childhood but in recent weeks they've been coming back.
The stories of a broken boiler don't seem so believable now that Cass is fifteen. The sounds are to humanoid to be just a malfunctioning boiler.
One particular eerie night the noises move upstairs.
As Cass carries out an investigation more questions are presented than answers and it's time for her parents to confess.